关键词: 长江堤防, 减压井, 机械淤堵, 径向模拟试验, 优化反滤系统

Abstract:

In order to investigate the influences of design, construction and operation conditions of relief well on its clogging, a series of seepage tests have been carried out for studying the related materials as well as their combinations. Besides conventional seepage tests, a special radial model test device has been developed to simulate site circumstance of groundwater movement around relief well. The possible varieties of foundation sand, gravel filter, plastic screen, removable polyurethane foam filter and inner tube are taken into account respectively or as a whole drainage system. Through the comprehensive analysis of tests both in laboratory and in situ, the mechanical clogging mechanism and its control are summarized. In view of actual hydrodynamic circumstances and operation conditions in Yangtze River dikes, an optimized filter system design for relief wells has been proposed.

Key words: Yangtze River dikes, relief well, mechanical clogging, radial seepage model test, optimization of filter system